Starten meiner android app, wenn GPS-Kraft schließt aktiviert ist

StackOverflow https://stackoverflow.com/questions/4092842

Frage

Kann jemand bieten einen Einblick in mein Problem bitte?

Meine app funktioniert, wenn GPS deaktiviert ist, aber FC beim Start, während GPS aktiviert ist. An einem kalten starten sie die Option auf den GPS einzuschalten bietet. dass durch Drücken der Zurück-Pfeil-Taste, kehrt in der App-Aktivität nach tun (obwohl das GPS-Symbol nicht sichtbar in der Statusleiste ist, auf einer Seite beachten, wie kann ich es hier angezeigt werden?).

ich die Anwendung verlassen, indem Sie die Zurück-Taste drücken oder die Menüoption während GPS noch eingeschaltet ist. Nun, wenn ich versuche, um die App zu starten, FC. Die blinkenden GPS-Symbol erscheint hinter dem FC Nachricht und verschwindet, wenn ich den FC bestätigen.

Hier ist der Code: 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    getLocation();
    setupWebView();
    this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

private void setupWebView() {
    final String centerURL = "javascript:centerAt("
        + mostRecentLocation.getLatitude() + ","
        + mostRecentLocation.getLongitude() + ")";
    webView = (WebView) findViewById(R.id.webview);
    // Get rid of white line on the right
    webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
    webView.getSettings().setJavaScriptEnabled(true);
    // Wait for the page to load then send the location information
    webView.setWebViewClient(new WebViewClient() {

        @Override
        public void onPageFinished(WebView view, String url) {
            webView.loadUrl(centerURL);
        }
    });
    webView.loadUrl(MAP_URL);
}

/**
 * The Location Manager manages location providers. This code searches for
 * the best provider of data (GPS, WiFi/cell phone tower lookup, some other
 * mechanism) and finds the last known location.
 **/
private void getLocation() {
    locationManager = (LocationManager) 
            getSystemService(Context.LOCATION_SERVICE);
    if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
        createGpsDisabledAlert();
    }
    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    provider = locationManager.getBestProvider(criteria, true);
    // In order to make sure the device is getting location, request
    // updates. Look to tweaking the arguments to this for a smooth ride
    locationManager.requestLocationUpdates(provider, 1, 0, this);
    mostRecentLocation = locationManager.getLastKnownLocation(provider);
}

private void createGpsDisabledAlert() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Your GPS is disabled! Would you like to enable it?")
            .setCancelable(false)
            .setPositiveButton("Enable GPS",
                    new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog, int id) {
                            showGpsOptions();
                        }
                    });
    builder.setNegativeButton("Use Wifi or 3g for location",
            new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            });
    AlertDialog alert = builder.create();
    alert.show();
}

private void showGpsOptions() {
    Intent gpsOptionsIntent = new Intent(
            android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivity(gpsOptionsIntent);
}

// Menu setup
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    menu.add(0, 0, 0, R.string.close).setIcon(
            android.R.drawable.ic_menu_close_clear_cancel);
    return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case 0:
        super.onStop();
        super.onDestroy();
        this.finish();
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}

@Override
protected void onResume() {
    locationManager.requestLocationUpdates(provider, 1, 0, this);
    super.onResume();
}

@Override
protected void onPause() {
    locationManager.removeUpdates(this);
    super.onPause();
}

/** Sets the mostRecentLocation object to the current location of the device **/
public void onLocationChanged(Location location) {
    mostRecentLocation = location;
    final String centerURL = "javascript:centerAt("
        + mostRecentLocation.getLatitude() + ","
        + mostRecentLocation.getLongitude() + ")";
    // This line is good to update the map with the current location
    webView.loadUrl(centerURL);
}

und das ist die logcat von Eclipse: 

11-04 11:45:10.774: INFO/ActivityManager(52): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.weuni.android.mups/.ViewCampusActivity }
11-04 11:45:10.925: INFO/ActivityManager(52): Start proc com.weuni.android.mups for activity com.weuni.android.mups/.ViewCampusActivity: pid=225 uid=10030 gids={3003, 1015}
11-04 11:45:10.934: DEBUG/AndroidRuntime(197): Shutting down VM
11-04 11:45:10.944: DEBUG/dalvikvm(197): DestroyJavaVM waiting for non-daemon threads to exit
11-04 11:45:10.954: DEBUG/dalvikvm(197): DestroyJavaVM shutting VM down
11-04 11:45:10.954: DEBUG/dalvikvm(197): HeapWorker thread shutting down
11-04 11:45:10.954: DEBUG/dalvikvm(197): HeapWorker thread has shut down
11-04 11:45:10.954: DEBUG/jdwp(197): JDWP shutting down net...
11-04 11:45:10.964: INFO/jdwp(197): adbd disconnected
11-04 11:45:10.974: DEBUG/dalvikvm(197): VM cleaning up
11-04 11:45:11.055: ERROR/AndroidRuntime(197): ERROR: thread attach failed
11-04 11:45:11.185: DEBUG/dalvikvm(197): LinearAlloc 0x0 used 636388 of 5242880 (12%)
11-04 11:45:11.485: DEBUG/ddm-heap(209): Got feature list request
11-04 11:45:11.555: DEBUG/NetworkLocationService(52): onCreate
11-04 11:45:11.555: DEBUG/ddm-heap(225): Got feature list request
11-04 11:45:11.595: DEBUG/LocationManager(52): Constructor: service = com.android.server.LocationManagerService@43ceb720
11-04 11:45:11.625: ERROR/ActivityThread(52): Failed to find provider info for com.google.settings
11-04 11:45:11.625: ERROR/ActivityThread(52): Failed to find provider info for com.google.settings
11-04 11:45:11.934: INFO/ARMAssembler(52): generated scanline__00000177:03515104_00000001_00000000 [ 73 ipp] (95 ins) at [0x45ef00:0x45f07c] in 1428001 ns
11-04 11:45:12.004: INFO/ARMAssembler(52): generated scanline__00000077:03545404_00000004_00000000 [ 47 ipp] (67 ins) at [0x33bf28:0x33c034] in 772000 ns
11-04 11:45:12.185: WARN/WindowManager(52): No window to dispatch pointer action 0
11-04 11:45:12.195: WARN/WindowManager(52): No window to dispatch pointer action 1
11-04 11:45:12.724: DEBUG/LocationManager(225): Constructor: service = android.location.ILocationManager$Stub$Proxy@43d14648
11-04 11:45:12.794: DEBUG/GpsLocationProvider(52): setMinTime 1
11-04 11:45:12.794: DEBUG/GpsLocationProvider(52): startNavigating
11-04 11:45:12.834: DEBUG/AndroidRuntime(225): Shutting down VM
11-04 11:45:12.834: WARN/dalvikvm(225): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
11-04 11:45:12.834: ERROR/AndroidRuntime(225): Uncaught handler: thread main exiting due to uncaught exception
11-04 11:45:12.894: ERROR/AndroidRuntime(225): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.weuni.android.mups/com.weuni.android.mups.ViewCampusActivity}: java.lang.NullPointerException
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.os.Looper.loop(Looper.java:123)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.app.ActivityThread.main(ActivityThread.java:4363)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at java.lang.reflect.Method.invokeNative(Native Method)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at java.lang.reflect.Method.invoke(Method.java:521)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at dalvik.system.NativeStart.main(Native Method)
11-04 11:45:12.894: ERROR/AndroidRuntime(225): Caused by: java.lang.NullPointerException
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at com.weuni.android.mups.ViewCampusActivity.setupWebView(ViewCampusActivity.java:41)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at com.weuni.android.mups.ViewCampusActivity.onCreate(ViewCampusActivity.java:35)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
11-04 11:45:12.894: ERROR/AndroidRuntime(225):     ... 11 more
11-04 11:45:12.934: INFO/Process(52): Sending signal. PID: 225 SIG: 3
11-04 11:45:12.944: INFO/dalvikvm(225): threadid=7: reacting to signal 3
11-04 11:45:12.944: ERROR/dalvikvm(225): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
11-04 11:45:13.165: DEBUG/ddm-heap(144): Got feature list request
11-04 11:45:13.265: DEBUG/ddm-heap(158): Got feature list request
11-04 11:45:13.315: INFO/ARMAssembler(52): generated scanline__00000077:03515104_00000000_00000000 [ 33 ipp] (47 ins) at [0x4bdcb0:0x4bdd6c] in 591000 ns
11-04 11:45:13.345: INFO/ARMAssembler(52): generated scanline__00000177:03515104_00001001_00000000 [ 91 ipp] (114 ins) at [0x4bdd70:0x4bdf38] in 752000 ns
11-04 11:45:13.375: DEBUG/ddm-heap(182): Got feature list request
11-04 11:45:13.385: DEBUG/ddm-heap(198): Got feature list request
11-04 11:45:14.265: DEBUG/NetworkLocationProvider(52): updateNetworkState(): Updating network state to 2
11-04 11:45:14.294: DEBUG/NetworkLocationProvider(52): onCellLocationChanged [0,0]
11-04 11:45:14.305: DEBUG/NetworkLocationProvider(52): onDataConnectionStateChanged 3
11-04 11:45:14.844: INFO/ActivityManager(52): Start proc com.svox.pico for broadcast com.svox.pico/.VoiceDataInstallerReceiver: pid=242 uid=10019 gids={}
11-04 11:45:14.995: DEBUG/ddm-heap(242): Got feature list request
11-04 11:45:15.624: DEBUG/MediaScanner(158): opendir /system/media/ failed, errno: 2
11-04 11:45:15.634: DEBUG/MediaScanner(158):  prescan time: 5425ms
11-04 11:45:15.634: DEBUG/MediaScanner(158):     scan time: 18ms
11-04 11:45:15.644: DEBUG/MediaScanner(158): postscan time: 2ms
11-04 11:45:15.644: DEBUG/MediaScanner(158):    total time: 5445ms
11-04 11:45:15.664: DEBUG/MediaScannerService(158): done scanning volume internal
11-04 11:45:15.674: DEBUG/MediaScannerService(158): start scanning volume external
11-04 11:45:15.694: VERBOSE/MediaProvider(158): /sdcard volume ID: 283779103
11-04 11:45:15.835: VERBOSE/MediaProvider(158): Attached volume: external
11-04 11:45:15.995: VERBOSE/MediaScanner(158): pruneDeadThumbnailFiles... android.database.sqlite.SQLiteCursor@43bb5fd0
11-04 11:45:16.005: VERBOSE/MediaScanner(158): /pruneDeadThumbnailFiles... android.database.sqlite.SQLiteCursor@43bb5fd0
11-04 11:45:16.036: DEBUG/MediaScanner(158):  prescan time: 123ms
11-04 11:45:16.036: DEBUG/MediaScanner(158):     scan time: 4ms
11-04 11:45:16.036: DEBUG/MediaScanner(158): postscan time: 52ms
11-04 11:45:16.036: DEBUG/MediaScanner(158):    total time: 179ms
11-04 11:45:16.065: DEBUG/MediaScannerService(158): done scanning volume external
11-04 11:45:19.655: INFO/Process(225): Sending signal. PID: 225 SIG: 9
11-04 11:45:19.685: INFO/ActivityManager(52): Process com.weuni.android.mups (pid 225) has died.
11-04 11:45:19.685: WARN/GpsLocationProvider(52): Unneeded remove listener for uid 1000
11-04 11:45:19.685: DEBUG/GpsLocationProvider(52): stopNavigating
11-04 11:45:19.795: INFO/UsageStats(52): Unexpected resume of com.android.launcher while already resumed in com.weuni.android.mups
11-04 11:45:20.085: WARN/InputManagerService(52): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@43d2d030
11-04 11:45:24.585: WARN/ResourceType(52): Resources don't contain package for resource number 0x7f0700e5
11-04 11:45:24.595: WARN/ResourceType(52): Resources don't contain package for resource number 0x7f020031
11-04 11:45:24.595: WARN/ResourceType(52): Resources don't contain package for resource number 0x7f020030
11-04 11:45:24.595: WARN/ResourceType(52): Resources don't contain package for resource number 0x7f050000
11-04 11:45:24.605: WARN/ResourceType(52): Resources don't contain package for resource number 0x7f060001
11-04 11:45:24.625: WARN/ResourceType(52): Resources don't contain package for resource number 0x7f060000
War es hilfreich?

Lösung

11-04 11:45:12.894: ERROR/AndroidRuntime(225): Caused by: java.lang.NullPointerException 11-04 11:45:12.894: ERROR/AndroidRuntime(225): at com.weuni.android.mups.ViewCampusActivity.setupWebView(ViewCampusActivity.java:41)

Es sieht aus wie Sie versuchen, ein Null-Objekt in der setupWebView () MeTHOOD Ihre Aktivitäten zuzugreifen, speziell Linie 41. Da haben wir alle den Code nicht und ich kann die Linien genau zählen, ich bin bereit, Ihr mostRecentLocation Objekt zu wetten, ist null, wenn der Aufruf der mostRecentLocation.getLatitude() und mostRecentLocation.getLongitude versuchen. Überprüfen Sie, ob es nicht null ist, bevor Sie versuchen, diese Methoden zu nennen. Der GPS-Empfänger kann manchmal etwas langsam sein, und eine nehmen kann, während tatsächlich eine Stelle bekommen.

Kommentar Antwort:

Das Problem ist, die Sie anrufen setupWebView (), bevor ein Standort tatsächlich empfangen wird. Wenn mostRecentLocation null ist, gibt es nichts, was man wirklich dagegen tun kann, bis ein Standort empfangen wird.

Sie können haben Umdenken, wie Sie Ihre App nur leicht funktioniert. Wenn mostRecentLocation null ist, möglicherweise einen Fehler oder ein Dialog angezeigt, die sagt, dass Sie für einen Standort auf jemanden warten. Dann, wenn ein Standort tatsächlich empfangen wird, onLocationChanged aufgerufen wird, und legen Sie den neuen Standort in der WebView es.

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